Сделайте это предложение во всех временах (в пасиве) . My mum usually sends her letters by post

Никак не может быть 9 предложений в пассиве, т. к. в пассивном залоге существует только 8 времён!
Во временах Simple Passive будут такие предложения :
1The letters are usually sent by post.
2.The letters were sent by post yesterday.
3.The letters will be sent by post tomorrow.
Во временах Continuous Passive :
1.The letters are being sent by post at the moment.
2.The letters were being sent by post this time yesterday.
Во временах Perfect Passive :
1.The letters have just been sent.
2.The letters had been sent by 5 p.m.yesterday.
3.The letters will have been sent by 5 p.m.tomorrow.